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I am thinking to get '10 CPO. I really like Active Roll Stabilization and M sterling wheel, so I am looking for one with M-package. M-package also comes with 19" or 20" wheels and all of the car around here have 20".

In general I like 20" wheels, but since BMW doesn't have spare and I do drive long distance , so I would have to have run flats. From what I can see there are total of 2 tires available for 20" wheels, Goodyear Excellence and Pirelli P Zero, and given that Excellence are touring I see P Zero are as the only option. P Zero are rated as 220 UTQG which means that I'll be changing them every 20K miles and I really don't like this idea.

Am I missing something about tires and there are more options or do you guys just stick with Pirelli P Zero and change them every 20K (slightly more than once a year for me)?

Or, should I just forget about M package and get 18" where I would be able to use say Potenza RE960AS?

our roads are just as good as any other concrete road around the world

18s dont have meatier tread, the tire has a higher sidewall but all tires regardless of size have the same tread depth from new. also, wear doesnt depend on tire size but on the treadwear rating..whether a tire has a hard of soft compound.